mirror of git://git.musl-libc.org/musl
make dlerror conform to posix
the error status is required to be sticky after failure of dlopen or dlsym until cleared by dlerror. applications and especially libraries should never rely on this since it is not thread-safe and subject to race conditions, but glib does anyway.
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@ -1,4 +1,3 @@
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#ifdef __PIC__
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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@ -18,6 +17,10 @@
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#include <ctype.h>
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#include <dlfcn.h>
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static int errflag;
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#ifdef __PIC__
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#include "reloc.h"
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#if ULONG_MAX == 0xffffffff
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@ -631,12 +634,13 @@ void *dlopen(const char *file, int mode)
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tail = orig_tail;
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tail->next = 0;
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p = 0;
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} else p = load_library(file);
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if (!p) {
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errflag = 1;
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goto end;
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}
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p = load_library(file);
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if (!p) goto end;
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/* First load handling */
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if (!p->deps) {
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load_deps(p);
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@ -674,8 +678,11 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
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if (!p) p=head;
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p=p->next;
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}
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if (p == head || p == RTLD_DEFAULT)
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return find_sym(head, s, 0);
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if (p == head || p == RTLD_DEFAULT) {
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void *res = find_sym(head, s, 0);
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if (!res) errflag = 1;
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return res;
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}
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h = hash(s);
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sym = lookup(s, h, p->syms, p->hashtab, p->strings);
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if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
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@ -686,6 +693,7 @@ static void *do_dlsym(struct dso *p, const char *s, void *ra)
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if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
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return p->deps[i]->base + sym->st_value;
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}
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errflag = 1;
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return 0;
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}
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@ -710,6 +718,8 @@ void *__dlsym(void *p, const char *s, void *ra)
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char *dlerror()
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{
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if (!errflag) return 0;
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errflag = 0;
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return "unknown error";
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}
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